A perennial plant
or perennial is a plant that lives for more
than two years.

(from the Latin “per”
meaning "through", and “annus”
meaning"year")

This term is usually applied to herbaceous non-woody plants plants or
small shrubs rather than large shrubs or trees, but used strictly it
also applies to the larger and longer-lived species. Perennials usually produce one or more flower crop
each year.
Compare with:
Annual;
Biennial; Ephemeral.